Gurobi 9.0 for AMPL now available

[Robert Fourer]

Gurobi 9.0 for AMPL is now available from all of our download links. There
are a few new options available for use in gurobi_options strings, listed
below.

Bob Fourer
4...@ampl.com


bqpcuts Whether to enable Boolean Quadric Polytope cut generation:
-1 = automatic choice (default)
0 = disallow BQP cuts
1 = enable moderate BQP cut generation
2 = enable aggressive BQP cut generation.
Values 1 and 2 override the "cuts" keyword.

nonconvex How to handle non-convex quadratic objectives and
constraints:
-1 = default choice (currently the same as 1)
0 = complain about non-convex quadratic terms
1 = complain if Gurobi's presolve cannot discard or
eliminate nonquadratic terms
2 = translate quadratic forms to bilinear form and
use
spatial branching.

relaxliftcuts Whether to enable relax-and-lift cut generation:
-1 = automatic choice (default)
0 = disallow relax-and-lift cuts
1 = enable moderate relax-and-lift cut generation
2 = enable aggressive relax-and-lift cut
generation.
Values 1 and 2 override the "cuts" keyword.

rltcuts Whether to enable generation of cuts by the Relaxation
Linearization Technique (RLT):
-1 = automatic choice (default)
0 = disallow RLT cuts
1 = enable moderate RLT cut generation
2 = enable aggressive RLT cut generation.
Values 1 and 2 override the "cuts" keyword.